AD7247AARZ

Overview

The AD7247AARZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead SOIC. It integrates two DAC channels with on-chip output amplifiers and a Zener voltage reference. The device operates with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key electrical specifications include a typical settling time of 8 µs to within ±1/2 LSB, a differential nonlinearity (DNL) of ±0.9 LSB maximum, and an integral nonlinearity (INL) of ±1 LSB maximum. It features a parallel interface structure accepting 12-bit data.

Feature Summary

• Dual 12-bit DAC architecture with integrated output buffer amplifiers and internal 5 V reference.
• Parallel loading structure with separate Chip Select inputs for each DAC channel.
• Operates from single (+12 V to +15 V) or dual (±12 V to ±15 V) power supplies.
• Typical settling time of 8 µs and low power consumption of 165 mW in single-supply mode.

Applications

• Interfacing with 8-bit or 16-bit microprocessors such as the Intel 8086 and Motorola 68000.
• DSP systems including the Analog Devices ADSP-2101.
• Multi-channel data acquisition systems requiring simultaneous or independent analog output updates.

Procurement Notes

Verify the specific suffix 'ARZ' corresponds to the SOIC-24 package and lead-free RoHS compliance status as defined by the manufacturer's ordering guide. Confirm that the industrial temperature range (-40°C to +85°C) meets the operational requirements of the target environment. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7247AARZ when a parallel interface with independent chip select lines for each channel is required, distinguishing it from the double-buffered AD7237A variant. Consider the ±1 LSB relative accuracy specification for applications demanding high linearity. Verify that the available output voltage ranges (0 V to +5 V, 0 V to +10 V, or ±5 V) align with the system load requirements, noting the capability to drive +10 V across a 2 kΩ load.

Part Context

The AD7247AARZ belongs to the DACPORT family, representing an enhanced version of the industry-standard AD7247. Improvements over the original model include extended operation up to 15 V supplies, faster interface setup times (30 ns typical), and improved reference stability with respect to supply voltage variations. It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7237A series serves as a functional alternative but utilizes an 8+4 bit double-buffered parallel interface rather than the direct 12-bit parallel structure of the AD7247A. Interface logic must be redesigned if substituting between these two models. Other members of the AD7247 family, such as the AD7247ABR or AD7247ATQ, offer different accuracy grades or temperature ranges while maintaining the same pinout and interface.